Differential gear, in Differential Gear automotive mechanics, gear arrangement that allows power from the engine to be transmitted to a set of generating wheels, dividing the force equally between them but permitting them to check out paths of different lengths, as when turning a corner or traversing an uneven street. On a straight street the wheels rotate at the same velocity; when turning a corner the outside wheel has farther to proceed and can turn faster compared to the inner wheel if unrestrained.

The components of the Ever-Power differential are shown in the Figure. The power from the tranny is sent to the bevel ring gear by the drive-shaft pinion, both of which are kept in bearings in the rear-axle housing. The case can be an open boxlike framework that is bolted to the band gear and contains bearings to support one or two pairs of diametrically opposite differential bevel pinions. Each steering wheel axle is attached to a differential side gear, which meshes with the differential pinions. On a straight road the tires and the side gears rotate at the same quickness, there is no relative motion between your differential aspect gears and pinions, plus they all rotate as a device with the case and ring gear. If the vehicle turns left, the right-hand steering wheel will be required to rotate faster than the left-hand wheel, and the medial side gears and the pinions will rotate in accordance with one another. The ring equipment rotates at a quickness that is equal to the mean swiftness of the remaining and correct wheels. If the tires are jacked up with the tranny in neutral and among the wheels is turned, the opposite wheel will turn in the opposite path at the same velocity.

The torque (turning instant) transmitted to the two wheels with the Ever-Power differential is the same. As a result, if one steering wheel slips, as in ice or mud, the torque to the other steering wheel is reduced. This disadvantage can be overcome somewhat by the utilization of a limited-slip differential. In one version a clutch connects one of the axles and the band gear. When one wheel encounters low traction, its tendency to spin is resisted by the clutch, hence providing higher torque for the various other wheel.
A differential in its most elementary form comprises two halves of an axle with a gear on each end, linked with each other by a third gear making up three sides of a sq .. This is usually supplemented by a fourth gear for added strength, completing the square.